In our haste to get everything out before Christmas, we omitted to machine the profile of the water pump base. This means, as supplied, the pump will not fit in the machined recess in the Hornplate Bracket. We will be correcting all the Water Pumps we still have in stock and you are welcome to return the pump to us for rectification. Alternatively, you can be simply grind/file the base until it fits in the machined recess. The actual poistion of the pump is determined by the fixing holes rather than the recess. There is a fair amount of material to remove, so as I said earlier in this post you are very welcome to return it to us for machining.